Electric-railway system



(No Model.)

E J.O.HENRY. ELECTRIC RAILWAY SYSTEM.

Patented July 23, 1895.

UNITED STATES PATENT 'FFIQE.

JOHN C. HENRY, OF WESTEIELD, NEW JERSEY.

ELECTRIC-RAILWAY SYSTEM.

SPECIFICATION forming part of Letters Patent No. 543,382, dated July 23,1895.

' Application filed May 13,1895. Serial No.549,165. (No model.)

To all whom it may concern.-

Be it known that I, JOHN C. HENRY, a citizen of the United States,residing at Westfield, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in Electric-RailwaySystems; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters and figuresof reference marked thereon, which form a part of this specification.

My invention relates to electric railways, and its object is to providean improved system of distribution, whereby the advantages of what iscalled the three-Wire system may be availed of, and at the same time thepotential on different sections of the line may be kept at differentvoltages, in order to meet difierent requirements as to speed, grade,and

' load. It has been proposed to use an auxiliary dynamo to supplycertain sections of the line with current-ata higher voltage than therest. I obviate the necessity of an extra generator, but accomplish thesame result.

My improved system consists in a threewire circuit fed by two generatorsof different constant potential, the line being divided into insulatedsections, each of which is connected with that one of the generatorswhich produces the potential suitable for that section. The rails of thetrack form the neutral conductor.

In the drawings I have shown a diagram of circuits embodying myinvention, the working conductors and the track beingillustrated inperspective. Two portions of track are shown, but each is the duplicateof the other.

The track Aand the overhead working conductors B, supported on poles Oand spanwires D, are all of the usual construction. The two portions ofroad shown are supposed to be divided into sections requiring differentvoltages. The section from a to a is acongested part of the city, wherethe cars E must run slowly. The section from a to b is an up and downgrade; that from b to b, a down and up grade; that from b to c, asuburban district where the cars may run rapidly. On the sections whereit is desired to run slowly age be arranged at six hundred and fifty.

The sections of the working conductors on which these different voltagesare used are electrically separated by insulating-connectors F.

Current is supplied to this system by two constant potential generatorsGH, the former giving a voltage of four hundred and the latter of sixhundred and fifty. These machines are compound wound, the armatures g hand series-coils g h being connected in series, and the shunt-coils g72. being also connected in series, forming a single shunt for the twomachines. The neutral conductor 1 is connected with theseries-field-coil circuit between the two machines at 2, and also withthe rails of the track A, which are electrically continuous. p

The positive brush of the dynamo G is connected by the feeders 3 withthose sections of the working conductor on which a potential of fourhundred volts is to be maintained, while the negative brush of thedynamo H is connected by the feedersetwith those sections of the line onwhich the potential is to be six hundred and fifty.

It will be seen that this system operates substantially in the samemanner as a threewire system of the usual construction, and that it alsosupplies different portions of the line with different voltages withoutthe use of an auxiliary dynamo. The peculiar connection of theshunt-coils is of especial importance, since I have found it tobeessential where constant potential dynamos of difierent voltages areconnected together-in series.

In a former application, Serial No. 546,541, I have shown dynamoscoupled up in the same manner as in this case, but for a differentpurpose, to wit: the regulation of the motors where the car is intraveling contact with all three mains, the motors taking current fromeither or both sides.

Having thus described my invention, what I claim is 1. In an electricrailway, a system of current distribution having sources of supply ofdifferent electro-motive force coupled together and feed conductorsconnected with said generators in the three wire or compensating systemand supplying current of different voltages to different sections of theroad, substantially as set forth.

3. In an electric railway, a system of ourrent distribution comprisingone or more working conductors divided into electrically separatesections, two dynamo electric generators of difierent electro-motiveforce coupled in series, feed conductors connecting the positive andnegative sides of said coupled generators with different sections of theroad, and a neutral conductor connected with said generators in thethree wire or compensating system and common to all the road sections,substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN C. HENRY. Witnesses:

S. W. TOWNSEND, J. J. BURNS.

